My App consists of a Activity where the Fragment are loaded.
In this case to load is fragment_automotor , it performs a search based on a patent, returns the data of the owner and in a RecyclerView classifies the debt today.
Said fragment has a LinearLayout where when clicking on a type of debt, a fragment (detail_fragment) is dynamically loaded with the detail thereof (this is done in this way because in addition to automotive can be consult other rates and reuse the code of this fragment).
When selecting one or more vouchers, a button appears indicating the amount to pay and when clicking, it redirects the payment.
The problem is that I pretend that this button is located at the end of the screen and I can not achieve it, I am superimposed on the vouchers and with white space underneath, maybe someone sees an error that I do not. I leave the xml of the fragment involved and an image for a better understanding of the problem
fragment_automotor
<android.support.design.widget.AppBarLayout
android:id="@+id/app_bar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:layout_marginHorizontal="10dp"
android:layout_marginTop="10dp"
android:background="#ffffff"
android:clipChildren="false"
android:clipToPadding="false"
android:elevation="8dp"
app:cardCornerRadius="@dimen/radius"
card_view:cardElevation="@dimen/card_elevation"
card_view:cardPreventCornerOverlap="false">
<LinearLayout
android:id="@+id/layout_busqueda"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginHorizontal="25dp"
android:orientation="horizontal"
android:padding="10dp">
<EditText
android:id="@+id/etBuscarPatente"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="0.6"
android:gravity="center"
android:hint="Patente"
android:textColorHint="@color/colorGreyDark"
android:maxLength="10"
android:textColor="@color/colorPrimaryText"
android:textSize="15dp" />
<Button
android:id="@+id/btnBuscar"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="0.4"
android:drawableLeft="@drawable/ic_search"
android:drawablePadding="5dp"
android:text="@string/search"
android:theme="@style/RaisedButton" />
</LinearLayout>
</android.support.v7.widget.CardView>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="false"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/cardDatos"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:layout_marginHorizontal="10dp"
android:background="#ffffff"
android:clipChildren="false"
android:clipToPadding="false"
android:divider="@android:color/transparent"
android:dividerHeight="0.0px"
android:elevation="8dp"
app:cardCornerRadius="@dimen/radius"
app:cardUseCompatPadding="true"
card_view:cardElevation="@dimen/card_elevation"
card_view:cardPreventCornerOverlap="false"
android:visibility="gone">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.3"
android:padding="3dip"
android:text="Cuenta N°"
android:textStyle="italic" />
<TextView
android:id="@+id/txtIdCuenta"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.7"
android:padding="3dip"
android:textStyle="italic" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.3"
android:padding="3dip"
android:text="Titular"
android:textStyle="italic" />
<TextView
android:id="@+id/txtTitular"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.7"
android:padding="3dip"
android:textStyle="italic" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.3"
android:padding="3dip"
android:text="Vehículo"
android:textStyle="italic" />
<TextView
android:id="@+id/txtDescripcion"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.7"
android:padding="3dip"
android:textStyle="italic" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.4"
android:padding="3dip"
android:text="Modelo"
android:textStyle="italic" />
<TextView
android:id="@+id/txtModelo"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.6"
android:padding="3dip"
android:textStyle="italic" />
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.4"
android:padding="3dip"
android:text="Patente"
android:textStyle="italic" />
<TextView
android:id="@+id/txtPatente"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.6"
android:padding="3dip"
android:textStyle="italic" />
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/rvComp1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="horizontal" />
</LinearLayout>
</android.support.v7.widget.CardView>
<LinearLayout
android:id="@+id/fragment_contenedor"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
</LinearLayout>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
MainActivity
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorBackground">
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
android:id="@+id/my_toolbar"
layout="@layout/toolbar" />
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</LinearLayout>
<android.support.design.widget.NavigationView
android:id="@+id/navview"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:headerLayout="@layout/header_navigation_drawer"
app:menu="@menu/nav_options"
android:fitsSystemWindows="true"/>
</android.support.v4.widget.DrawerLayout>
</FrameLayout>
detail_fragment
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/txtTipoDeudaComprobante"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:gravity="center"
android:padding="3dip"
android:textSize="18dp"
android:layout_marginBottom="5dp"
android:visibility="gone"/>
<android.support.v7.widget.RecyclerView
android:id="@+id/rvCompxTipo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical"/>
</LinearLayout>
<Button
android:id="@+id/btnPagar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:background="@color/colorPrimary"
android:drawableRight="@drawable/ic_chevron_right"
android:padding="5dp"
android:drawablePadding="10dp"
android:visibility="gone"
android:textColor="@color/colorWhite"
android:textStyle="bold|italic" />